TOPIC TEST (1) 92%

Pedigrees are used to help geneticists understand how traits are inherited between generations. The Romanovs, a Russian royal family, had a history of hemophilia, a sex-linked disorder that is determined by a recessive allele on the X chromosome. What is the best evidence to prove that Irene was heterozygous for hemophilia? A) Alice carried the recessive allele. B) Alexandra carried the recessive allele. C) Frederick carried the recessive allele. D) Waldemar carried the recessive allele.

Mary has type A blood. Her son Bill has type AB blood. Which blood type does Bill's dad have if he is homogenous for blood type? A B AB O

In a dihybrid cross for round and yellow seeds (RrYy x RrYy), what is the probability of having green and wrinkled seeds? Key: R = round r = wrinkled Y = yellow y = green 1:16 3:16 8:16 9:16

Which was most likely an effect on society that resulted from improvements in blood handling during World War I and World War II? More soldiers died as a result of incorrect blood typing. More soldiers who had lost a limb returned home. More donations were needed as a result of poor storage techniques. More organizations spoke out against the war.

Which of Thomas Hunt Morgan's hypotheses was valid? White eyes are lethal in female Drosophila. White eyes are lethal in male Drosophila. White eyes are homozygous recessive in female Drosophila. White eyes are the dominant trait in female Drosophila.

A purebred plant that has yellow flowers is crossed with a purebred plant that has white flowers. All the offspring have yellow flowers. Which conclusion about yellow flowers is supported by these results? Yellow flower color is a dominant trait. Yellow flower color is a recessive trait. Yellow flower color is a heterozygous trait. Yellow flower color is a monohybrid trait.

In peas, yellow seed color (Y) is dominant to green seed color (y). Which describes an organism that has nonidentical alleles for seed color? yy and has green seeds Yy and has yellow seeds YY and has yellow seeds Yy and has green seeds

Paolo hypothesizes that thick leg muscles are an inherited trait in dogs. He collects data about several dogs. The data show that dogs that live outdoors have thicker leg muscles than dogs that live indoors. What should Paolo conclude? Inheritance of thick leg muscles is associated with coat thickness. Inheritance alone may not account for thick leg muscles. Dogs that have thick leg muscles require more exercise than dogs that have thin leg muscles. Dogs that inherit thick leg muscles may not survive indoors.

A student is given a list of traits and is asked to organize them in a Venn diagram as shown below. mc009-1.jpg Which traits should the student put in section I (Inherited)? wolf's social status and blood type skin color and a scar tiger's stripes and blood type a scar and wolf's social status

Which of Mendel's generations was allowed to self-pollinate? F1 generation P generation F1 generation and F2 generation P generation and F2 generation

Which type of scientific statement is defined as a hypothesis or group of hypotheses that can be accepted as true based on repeated experimentation with similar results? hypothesis theory law probability

A scientist is studying fruit fly wings. Straight wings are dominant, and curly wings are recessive. Which statement correctly describes the F1 generation if a straight-winged parent is crossed with a curly-winged parent and if both parents are true breeding? The offspring will have two genes for straight wings. The offspring will produce only gametes that have genes for curly wings. The offspring will have one allele for straight wings and one allele for curly wings. The offspring will have only one kind of allele for the gene that determines wing type.

If a person has type B blood, which statement describes the antibodies present in his or her blood? Only anti-A antibodies are present. Only anti-B antibodies are present. Both anti-A and anti-B antibodies are present. Neither anti-A nor anti-B antibodies are present.

Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree. mc023-1.jpg In the pedigree that is shown, which represents Irene's allele combination? XhXh XHXh XHXH XhY

Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Which best describes glaucoma? a recessive trait that requires multiple recessive alleles to be expressed a polygenic trait that is influenced by the number of alleles present a codominant trait that is expressed more often when more dominant alleles are present a dominant trait that depends on the presence of only one of many dominant alleles

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. What is the probability of having offspring that have wrinkled seeds and yellow seed color for the cross RRYY ´ RrYy? 0 percent 25 percent 50 percent 100 percent

Which allele combination represents a male who has an X-linked recessive disorder? XrY XRY XrXr XRXr

In peas, yellow seed color (Y) is dominant to green seed color (y). A homozygous green pea plant is crossed with a heterozygous yellow pea plant. What is the predicted phenotypic ratio of the offspring? 50 percent yellow, 50 percent green 50 percent Yy, 50 percent yy 100 percent yellow, 0 percent green 100 percent Yy, 0 percent yy

A pea plant exhibits a recessive trait. Which statement is most likely true about the plant? The plant is identical to its parent plant. The plant has different alleles for the gene that codes for the trait. The plant has two identical alleles for the gene that codes for the trait. The plant does not have the same genes for the trait as its parent plant.

In the F2 generation of Mendel's crosses, all plants had the dominant trait. half of the plants had the dominant allele. all plants had both the dominant and recessive alleles. one in four plants had two alleles for the recessive trait.

Gregor Mendel used pea plants that were heterozygous for each of two traits—seed color and seed shape—to generate a dihybrid cross. The phenotypic ratio of the resulting offspring was nine with round and yellow seeds, three with round and green seeds, three with wrinkled and yellow seeds, and one with wrinkled and green seeds. From these results, what could Mendel conclude? Traits are inherited as pairs, sets, or groups. Traits that are dominant mask traits that are recessive. Gametes carry one allele for each trait. Traits are passed independently of one another.

hich Punnett square represents a cross between two parents that are heterozygous for purple flowers? mc006-1.jpg mc006-2.jpg mc006-3.jpg mc006-4.jpg

Which is an external environmental factor that affects heredity? gender structural differences nutrition hormones

Which trait is determined by both genetics and the environment? eye color athletic ability blood type a scar

Hemophilia is an X-linked recessive disorder. mc005-1.jpg What is the probability of having hemophilia for the cross that is shown in the Punnett square? 0 percent 25 percent 50 percent 75 percent